Tuna Melt Mac 'n Cheese - Rachael Ray's non profit organization, Yum-o!

Ingredients

• Salt
• 1 pound hollow cavatappi, elbows with lines or macaroni with lines, regular or whole grain
• Extra virgin olive oil (EVOO) for drizzling, plus about 3 tablespoons
• 12 ounces line-caught canned tuna, drained (such as salt-free American sustainable canned tuna from Lobster Place)
• 1/2 cup finely chopped herbs such as dill, parsley and tarragon
• 1/2 cup finely chopped red onion or scallions, whites and greens
• 1-2 small ribs celery, finely chopped
• Juice of 1 lemon
• 2 tablespoons Dijon mustard
• Pepper
• 1 stick butter, divided
• 3 tablespoons flour
• About 2 1/2 cups whole milk
• 2 cups grated white cheddar or Gruyère cheese
• 1 cup grated parmesan cheese
• 1 1/2 cups homemade breadcrumbs or panko breadcrumbs